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Summary: Discerning Evolutionary Processes in Patterns of
Tamarin (Genus Saguinus) Craniofacial Variation
Rebecca Rogers Ackermann1,2
and James M. Cheverud1
*
1
Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110
2
Department of Archaeology, University of Cape Town, Rondebosch 7701, South Africa
KEY WORDS cranial morphology; Callitrichidae; variability; quantitative methods; genetic
drift
ABSTRACT Quantitative genetic theory specifies evo-
lutionary expectations for morphological diversification by
genetic drift in a monophyletic clade. If genetic drift is
responsible for the evolutionary morphological diversifica-
tion of a clade, patterns of within- and between-taxon
morphological variance/covariance should be proportional.
We tested for proportionality of within- and between-spe-
cies craniofacial morphological variation in 12 species of
tamarins (genus Saguinus). We found that within- and
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